body, p, h1, h2, h3, h4, ul {
    margin: 0;
}
ul {
    padding: 0;
    list-style: none;
}
img {
    border: none;/* 为了适应IE */
    vertical-align: middle;
}
a {
    text-decoration: none;
    color: #3c3c3c; 
}
a:hover {
    color: #66A9C9;
}
input, button {
    padding: 0;
    outline: none;
    border: none;
}
button:hover {
    cursor: pointer;
}
body {
    font: 16px/1.5 tahoma,arial,'Hiragino Sans GB','\5b8b\4f53',sans-serif;
    color: #3c3c3c;
    background-color: #f4f4f4;
}

.clearfix::after {
    content: '';
    display: block;
    clear: both;
}
.fl {
    float: left;
}
.fr {
    float: right;
}
.layer {
    width: 1190px;
    margin: 0 auto;
}